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small air-filled sac-like structures from which the lungs are made
structure within the cell cytoplasm that is surrounded by its own membrane and has a specific...
movement of the Earth's continents as the Earth's tectonic plates shift.
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
in plants: the structure within a seed that will develop into the new plant.